Symbol for halogen1/10/2024 Iodine is essential for human and animal nutrition, but serves no biological role in plants. ![]() A 70-kg human contains about 260 mg of bromine. No known biological role in humans is known, but a person consumes 1 to 20 milligrams of the element each day. A typical 70-kg human contains between 3 and 6 grams of fluorine.īromine occurs in all organisms. It’s possible trace amounts of this element are essential for human nutrition. The average 70-kilogram person contains about 95 grams of chlorine.įluorine is found in bones, teeth, hair, blood, urine, and eggs. Tennessine is not found in nature.Ĭhlorine is an essential element for plants and animals. Astatine is rare and not found in living organisms. Biological Roleįluorine, chlorine, bromine, and iodine all occur in the human body. Astatine and iodine isotopes find use in nuclear medicine. Iodine and bromine are used in halogen lamps, which glow with a whiter color than other incandescent lights. These two elements are widely used as flame retardants. Chlorine and bromine are disinfectants used to treat wounds, clean surfaces, and protect pools and spas. This makes the halogen group the only element group that contains all three normal states of matter at room temperature and pressure. Scientists predict tennessine is a solid. Fluorine and chlorine are gases at room temperature.
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